Questions tagged [blockchain]

This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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How to Retrieve My Bitcoin Cash Sent to a Bitcoin Wallet

I accidentally sent Bitcoin Cash from my Payeer account to a Merchants Bitcoin Wallet, The Marchant never received it, They don't have a Bitcoin cash account and Only a Bitcoin Wallet account. Am I ...
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Storage of the transaction chain [duplicate]

I was looking into the bitcoin developer documentation and going through the RPCs. I was wondering if the blockchain consisted of the list of transactions, then how is the transaction information ...
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Space of Bitcoin Blockchain

I am a beginner of Bitcoins. I read here that the size of the blockchain is heavy HUNDREDS of gigabytes. I also read that one of the reasons bitcoin is safe is that EVERY user keeps a local copy of ...
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Signing a Transaction with Master Node for Derived Account

I am trying to learn HD Wallets. For that purpose, I build something on Solana. I've created derived accounts and can sign transactions with their private/public keys. Here is my code: const ...
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1answer
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Changing the blockchain requires more than just recalculating all hashes..?

New here! I read this everywhere - "To change some data in a blockchain, the malicious user will have to recalculate hash for every block starting from that particular block". My doubt is - ...
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Do Wallets need to be verified or activated? Crypto Support asking me to do that [duplicate]

1.5Bitcoins were stolen form me in 2019, and a company Merawing contacted me a few weeks again, saying that they work with Crypto Regulation of Cyprus and that they would help me getting my bitcoins ...
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1answer
36 views

Why is the rate of reindexing chainstate not constant?

What determines the speed of the reindexing-chainstate in the different times? I spend a few days (2 week) for reindexing locally on my new HDD, and I noticed one thing: the speed of reindexing is ...
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38 views

Why one of my wallet ID is associated with my other wallet ID in blockchain [closed]

My blockchain recovery phrase is compatible or associated with other of my wallet ID
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Where can I download the bitcoin blockchain to do offline analysis?

Where can I download the bitcoin blockchain to do some offline analysis. edit: Ideally I'd like to download .txt (or another file extension, e.g. .dat, as long as the contents are unencoded and human ...
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1answer
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Crpyto Bitcoin Insurance

How will the Bitcoin Crypto market compete against theft, if other fiat currencies have similar to FDIC insurance? In this article, some thieves did a phone swap, got a two factor authentication code,...
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How to load Bitcoin-qt using blockchain directory already existing on a hard drive?

I've had issues with downloading the blockchain using windows/mac. For some reason, it would eventually cause an issue whilst downloading and cause me to have to start again. Instead, I have been ...
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Inactive nodes, validation & 51%; full & partial nodes; validation by miners vs wallets

Questions Suppose a node doesn't have internet connection then it would not receive the broadcast of other nodes then does the blockchain propagates without the validation of that node ( that is, is ...
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Why discrepancies in blockchain GB size between Mac and web sources?

On a Mac which Bitcoin Core updated a few minutes ago, the the Blocks folder contains 409.55 GB and the Chainstate folder contains 4.57 GB. But... https://www.blockchain.com/charts/blocks-size shows, ...
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How can I get RawTX transactions?

I used to be able to get RawTX transactions on the Blockchain using the link: https://blockchain.info/tx/60183ab915f2f4b0190605f98bd0e9f8eafe13a1c902b3ae87ecd0dfc8a599a0?format=hex But the site ...
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3answers
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Do I have a chance to commit a transaction without any network fee?

I know how transaction fees are calculated. Also I understand that a transaction with a higher fee will be approved much faster than a transaction with the lowest one. Does the bitcoin protocol allow ...
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Retrieve my bitcoin balance

I have a bitcoin balance,what's the process I need to follow to spend my balance in my bitcoin address.
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How many blocks extra does one need before it's competitor is deemed stale?

so when two equally valid blocks are discovered at roughly the same time, a conflict occurs, nodes should wait for the strongest fork of the chain to emerge and develop before placing trust in the ...
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How do I use Bitcoin Core (fully synced) to "backtrack" a receive address?

I'm trying to "reverse-track" my current Bitcoin wallet to see its exact history on the blockchain, backwards. I have a fully synced Bitcoin Core installed. What command do I use in its ...
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1answer
47 views

Why .bitcoin is at /root in Arch/Manjaro Linux?

I've installed bitcoin-core and downloaded the blockchain in Ubuntu. Now that I have switched to Manjaro Linux and installed bitcoin-core again, It creates the .bitcoin directory in /root/.bitcoin/ ...
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How to merge the datadir with .bitcoin directory?

I changed the path of datadir in bitcoin.conf from .bitcoin directory to somewhere else. Now that I need to backup my blockchain data, I want to have both .bitcoin and blockchain data together. ...
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how to do sha256(sha256(modified transaction)) and find z1 and z2 value

hi I tried to get z1 and z2 value but I cant understand. can any one help me with example for finding z1 and z2. or alternate website for 2coin.org example: see this trans. Two identical R value ...
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How bitcoin exactly works?

Everyone says, Bitcoin is decentralized. No central server is "hosted the app" But no matter how hard i am trying to get a grasp of it, i still couldn't understand how it works for exactly ...
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My bitcoin was approved but not spent [duplicate]

So i found out that my transaction was deemed suspicions for money laundering I guess. lol... of course it wasn't. I opened an account with bitcoin exchange and when i went to blockchain.com to send ...
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Power outage during Bitcoin Core initial synchronization

I had a power outage when I was half way through my Bitcoin Core initial synchronization. Is there a way to pick up where it left off or do I need to start over?
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1answer
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Already mined block hash showing zeros at the end when I hash it in online sha256 two times

Hi I tried hashing a already mined block with this block header ...
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1answer
63 views

My transaction is in review for over 24hrs on blockchain, I want to cancel it

Please I want to cancel my in review transaction on blockchain. How will I go about it. Please help me,I need answers as soon as possible.
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I sent a token to trust wallet from binanve and after some time i sent the same token to binance that was given by trust wallet and didnt get it? [closed]

I sent a token to trust wallet from binance and after some time i sent the same token to binance that was given by trust wallet and didnt get it?
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Binance: How to check BTC value by USDT at time of arrival after blockchain disabled it

Let's say that i received an amount of BTC to my Binance wallet like one week ago. How can i know the value of it By USDT at time of arrival. Usually, i was check that from blockchain.com directly ...
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1answer
28 views

If the prices of virtual currencies on multiple platforms are different, can you buy low and sell high to make a profit? [duplicate]

I have observed that the prices will be different, can I earn the difference?
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66 views

Does Bitcoin-core support creating a new Bitcoin blockchain?

My goal is to add a new feature to Bitcoin, which requires changing the structure of the Bitcoin blockchain. So I was wondering if Bitcoin Core supports having a new/own Blockchain? If so, how to do ...
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Help analyzing this color coded hexdump of the Bitcoin blockchain

Sample of genesis, growth, and current height Sample of the latter part and the end of blk02655.dat. This probably covers parts of the last 10000 blocks. Process here: https://twitter.com/...
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Nothing-Up-My-Sleeve BTC Addresses [duplicate]

I've been researching some crypto related concepts and came across "Nothing-Up-My-Sleeve Numbers" and from what I understand I can generated a Bitcoin address that basically comes with an ...
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How can i import my wallet with old address

I had a bitcoin wallet and I have seed phrase but when I use it I can't access all my old wallet's addresses I read that I can use this site: https://iancoleman.io/bip39/ I actually used it and ...
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Suppose crypto is adopted globaly, and 100 years pass. Where would 100 years worth of global transactions/smart contracts be stored?

To my novice understanding the blockchain is stored on all participating computers in the network. is this to say each computer has the entire chain downloaded onto the hard drive? Or do we merely ...
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1answer
64 views

Bitcoin BTC wallet receive addresses

I want to create 100 to 500 to 1000 BTC receive addresses. It should not expire. Is it possible ? Is it possible in Bitcoin core ?
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What if a pool of computers are used to attack a blockchain and modify it in 51% of the network? [duplicate]

I mean if a large computer pool is used to attack a blockchain and modify the copy of the blockchain in 51% of computers in the network. Then due to consensus, the faulty blockchain will be replicated ...
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TRACING A TRANSACTION [duplicate]

Thanks in advance for your answers. In 2017 I invested in bitcoin without any experience or knowledge of the processes involved. I have records of the transactions through Coinjar but don't know where ...
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1answer
28 views

Says "confirmed" but never received [duplicate]

I sent someone bitcoin through cash app and it says confirmed but the recipient said they never received it, is there a reason this could be happening? Or is there a way for me to get it back from the ...
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1answer
83 views

Blockchain not letting me send all of my bitcoin (Please help) [closed]

I've been using blockchain for the past couple years and i have received lots of transactions (daily) for the past time. Today i decided to have them transferred to a Trading app which I've always ...
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1answer
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Noob question: Why is there not a limit of the number of blocks in a chain revision?

I have a noob idea and I want to understand where I'm going wrong :) Say nodes agreed on a block revision limit, say, 6. This would mean that if they see an incoming chain that is longer than the ...
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fatal error using Win Bitcoin core to create node

It ran about 10 hours, loaded 70% of blockchain, now always this error in debug.log on restart 2021-06-21T14:11:58Z ERROR: ReadBlockFromDisk: Errors in block header at FlatFilePos(nFile=1801, nPos=...
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1answer
45 views

Python code error : Hash greater than Target

While trying to run a reference code from GitHUb i am getting an error "Cannot Mine-Hash is greater than Target". As i am just a beginner with coding i am not able to figure this out. Kindly ...
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1k views

Should I share my seed phrase to earn airdrop tokens?

Someone on Face Book said I could earn free crypto by appying for an airdrop. He told me to download Blockchain from app store to my phone. I did this and created my account with a password. I also ...
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1answer
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Scenario: What would happen to Bitcoin if the internet would crash - world wide [duplicate]

What would happen to Bitcoin if the internet or power would be shut down for a moment, all over the world? Would this destroy Bitcoin or other block chain based money or technology?
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Are multiple parents/children possible in a block?

I always learnt/thought bitcoin blockchain is like a linked list and it can have only one parent and one child at max
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41 views

How to make a block given transaction ids, fee ,weight, possible parents

I have a list of transactions in this form 6c665f1d784d2032a13fa0986f08a3306bb1a4430049787cb1b692ed0d5d9bde,302,1136,cbf57b4e77708a6d920a63e9584cb482b03c42374b6a49e6057170a9354a89c5 txid, fee, weight, ...
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1answer
41 views

Can I merge blockchain downloads?

I downloaded the most recent 15GB of the Bitcoin blockchain. But I also have a back up from a year ago when I downloaded some more. Can I merely copy the old blockchain files into ~/.bitcoin and have ...
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2answers
61 views

Delay of a revocable transaction in the Lightning Network

The Lightning Network Whitepaper describes the concept of Revocable Sequence Maturity Contracts (RSMC), which allows a commitment transaction to be revoked during a predefined delay after the channel ...
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Isn't burning bitcoins a kind of fraud?

BitCoin burning is the process by which digital currency miners and developers can remove bitcoins from circulation, thereby slowing down inflation rates or reducing the total circulating supply of ...

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